feat: Support HTTP urls for assets

README.md

@@ -67,6 +67,8 @@ services:
       YAL_IMAGES_FOLDER: /app/images
       # Omit file extension as it will be picked up by name automatically
       # each of the entries is searched like ${YAL_IMAGES_FOLDER}/<icon>{png,jpg,jpeg,svg}
+      # if that does not succeed, an attempt is made to load the path as is and if
+      # there is no such file it tries to load it as an URL.
       YAL_MASCOT: mascot # the mascot to display on the left
       YAL_LOGO: logo # logo to display on the right
       YAL_BACKGROUND: background # background image for page

pkg/config/env.go

@@ -19,8 +19,10 @@ func envWithDefault(variable string, fallback string) string {
 func imageFromEnv(variable string, fallbackFile string) (string, error) {
 	path := envWithDefault(variable, fallbackFile)
 	resolvedPath, err := assets.LookupImgAnyExt(path2.Join(ImageFolder(), path))
+	// in case file can not be found locally try to load from URL
+	// or search for full file name
 	if err != nil {
-		return "", err
+		return assets.InlineIcon(path)
 	}
 
 	return assets.InlineIcon(resolvedPath)